• Journal of Construction Engineering and Project Management
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• 제7권1호
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• pp.1-12
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• 2017

Construction delay is one of the basic constrains to achieve the project objectives in developing countries. This study aims to find the causes and effects of construction delays in developing countries. A thorough literature review has been done following the content analysis method. The relevant literature of 28 developing countries was collected from the scholarly journals published in the period of 2006 to 2016. The different developing countries are grouped into three geographic regions, i.e. South and Southeast Asia, Middle East, and Africa. In these regions, total 53 potential causes of delay under 8 major groups are identified. Frequency and ranking of these factors have been done. The factors, delay in progress payment by owner, contractors' cash flow problem, improper planning and scheduling, poor site management, and change order by owner during construction, are acknowledged as critical causes of delay in developing countries. This study will assist both academic and professional experts providing more insight about the construction delays and project management in developing countries.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.440-448
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• 2009

Concurrent construction (or overlapping) is an alternative project delivery process to reduce time-tomarket such that the owner can get higher profits; the increased profits due to shortened project duration would exceed the loss of profits from the increased cost, if any. For more effective concurrent construction, a new conceptual framework for concurrent construction planning is suggested. With multiple work methods available in each activity, the performance of overlapping between two activities in terms of cost is affected by the compatibility between work methods selected and the benefit to the project owner is determined by internal rate of return (RoR). The impact of the compatibility between work methods and the conceptual framework are explained by a hypothetical case study.

• 한국건설관리학회논문집
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• 제6권4호
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• pp.91-100
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• 2005

건설 전체 프로세스를 하나의 주체가 단일 책임하에 수행하는 일괄입찰방식은 설계와 시공의 연계로 인한 기술력확보, 공기단축, 사업비절감, 품질확보 등의 예상효과로 인해 적용이 확대되리라 예상되는 발주방식의 하나이다. 한편, 국내 일괄입찰방식의 낙찰자 결정방법은 일괄입찰방식으로 수행되는 모든 프로젝트에 동일한 배점기준을 적용하도록 되어 있어, 일괄사업자 선정시 발주자의 목적과 프로젝트의 특성을 반영하기 어려운 것이 현실이다. 이에 본 연구에서는 일괄사업자 선정에 있어서 발주자의 목적과 프로젝트의 특성을 반영할 수 있는 일괄입찰방식의 적격심사 분야별 배점 결정모델을 제안함으로써, 발주자가 당해 프로젝트에 최적인 일괄사업자를 합리적으로 선정하는 것을 돕고자 하였다.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2001년도 학술대회지
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• pp.454-457
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• 2001

성공적인 공사수행을 위하여 공정관리는 건설공사 참여주체 모두가 관심가지고 지속적으로 관리해나가야 하는 부분이다. 또한 세부공정을 관리하는 시공자의 책임만 중요한 것이 아니라 정해진 공기 내의 공사수행으로 그 목적한 바를 이뤄야하는 발주자에게 있어서도 지속적으로 관리해야하는 부분이다. 특히, 대형공사의 경우 발주자는 시공자를 지휘 · 감독하기 위해 공정관리 프로세스를 이용하여 진도율을 관리해야 한다 이때 공정이 지연되거나 변경될 경우 빠른 시간 내에 만회대책을 수립하여야 한다. 본 연구에서는 이러한 발주자의 공정관리 프로세스를 IDEF 방법론을 이용하여 규명하여 건설 프로세스 모델을 제시하고자 한다.

• 한국BIM학회 논문집
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• 제3권2호
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• pp.19-27
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• 2013

The application of the BIM for the KEPCO' new headquarters in Naju involved alternative approaches and accompanied many trials-and-errors as the project adopted new targets and purposes that were not used in Korea before. In particular, for a large BIM-based project, clearly defining the BIM-including the objective, scope and the outcome-is critical for a project owner. For a successful implementation, project owners should improve the utilization of the BIM. Against this background, this research examines the case of the BIM application for the KEPCO' new headquarters in Naju, identifies its effects and problems, and proposes how to improve application of the BIM for public projects. The improvement in the BIM application can be divided into several stages: project order, design development, construction, and post-construction maintenance. In the initial stage, it is important to fully discuss the project planning among participants, and clarify the goal, scope, expected outcomes and role of the BIM. In the design stage, the level of detail (LOD) for the 3D model should be defined in consideration of information use in the stages of estimation and construction. In the construction stage, the scope of project that is managed based on the processing and use of the BIM data should be clearly given and understood. After construction is complete, measures should be sought to use the BIM for maintenance, and corresponding requirements and outcomes should be provided. The analysis is expected to provide basic data for successful implementation of BIM-based public projects, by assisting project owners and involved parties in enhancing work in different stages of a project.

• 국제학술발표논문집
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• The 1th International Conference on Construction Engineering and Project Management
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• pp.1158-1164
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• 2005

This study suggests how to classify owner's standard specifications in organizations such as local governments which place an order for constructing general and various types of facilities. And the principal conclusions of this study can be summarized as follows; first, the Standard Specifications for Seoul Metropolitan Government of for all facilities could be integrated by seven individual works. Second, it is advisable from a viewpoint of long term to draw up integrally owner's standard specifications by trade for facilities, rather than draw up by group of facilities. Third, editing integrated standard specifications for all trades to meet the unified work classification structure should be backed up by high technology, therefore owner's standard specifications by trades would be favorable to our situation.

• 도시과학
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• 제6권2호
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• pp.73-80
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• 2017

A submittal, as a part of three main project management processes: production control, submittals and change orders, is the transmission of information from the subcontractor to the general contractor to the owner, architect, and structural engineer, for review and approval. The purpose of the submittal process is for submittals to be approved in order to start construction. This benefits the contractor by ensuring that the finished project will meet the expectations of the owner. This paper analyzed a case study regarding the submittal process for the local-based environmental construction company, which typically works as a subcontractor and may hire other subcontractors for additional work when applicable. The aim of this study was to roughly evaluate a project management process and understand the submittal process through the study of a case involving the local company.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.1067-1074
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• 2022

An architect creates his/her design to meet owner's requirements. Floor plans, perspective drawings, and scale models are used in order for the owner to choose the design. The tools are a little helpful for communication between the architect and the owner in case the owner does not know architecture. The scale models are good, but it is hard to make scale models while design is in progress. 3D CAD is a good tool for communication, but it is time-consuming and requires high-performance computer hardware. Augmented reality is able to show 3D virtual models that are updated by the architect with smart devices such as a smart phone and a tablet PC. The owner frequently reviews the updated design anytime anywhere. This study proposes a method to use augmented reality for architectural design and construction management. The method supports the communication between the owner, the architect and the contractor to review updated designs, and to complete the building project. 3D models expressed in augmented reality are created using SketchUp with 2D drawings for building construction. An Android application implementing augmented reality is developed by Qualcomm Vuforia and Unity on smart devices. Drawings as markers and 3D models are connected in Unity. And functions that temporarily hide unnecessary parts can be implemented in C# programming language. If an owner, an architect, or a contractor looks at a smart phone on a 2D drawing, he/she can identify building elements such as 3D buildings or columns on a screen. This can help communication between them.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.649-657
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• 2022

The COVID-19 pandemic has unprecedented impacts on different sectors around the globe. The effects observed in developing countries are even more severe. Some projects stopped while many have cost and time overrun issues. This paper conducted a case study on the COVID-19's effects on a hotel construction project in Nepal. The study reviewed the literature on COVID-19 and its impact on construction sectors and conducted a semi-structured interview with the project's personnel. The interview response was analysed and the contributing factors that impacted the project and its performance were identified. The paper found financial, operational, contractual, safety, and risk management issues in the hotel project. Overall, the project cost increased by 32% where the material cost increased by 35% and labor cost increased by 28%. This research discusses causes, measures, and provides a broad perspective of the problems, significant challenges, and opportunities associated with the effects of COVID-19 on the construction industry. The Owner as well as the Contractors incurred added costs because of COVID-19. The paper identified contributing factors and presented the challenges which could be used as opportunities to minimize unforeseen impacts of the pandemics in near future. The lesson learned from this case study was that the labor cost and materials cost could have been minimized if the Owner and the Contractor had established alternative resources such as using locally available labor, materials, and alternative suppliers.

• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.141-144
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• 2013

This paper presents a system called a Cash-flow based Construction Schedule Optimization system(CfSO). The existing CPM effectively handles schedule and cost management. However, funding strategy should be considered to obtain maximum profit and to progress a project favorably. One of measures is to coordinate the contract terms between owner and subcontractors (or suppliers). Contractor may decrease the interest cost attributed to project financing by adjusting the timing of cash-inflows and cash-outflows. It is an excellent method maximizing profits. This paper presents a method to estimate the amount of a cash-flow occurred periodically by integrating the terms of contract into scheduling. The proposed method is implemented as a system prototype in Microsoft Excel. This system provides a user an automated tool that identifies an optimal schedule that secures maximum profit by adjusting start and finish times of non-critical activities' free-floats without affecting on the project completion time. This system supports a project manager to establish an optimum project schedule and identifies profitable contractual conditions against to a construction owner.